A.前向釋放信號(hào) B.后向釋放信號(hào) C.釋放監(jiān)護(hù)信號(hào) D.呼叫故障信號(hào)
A.Handover Request B.Handover Access C.Paging D.Paging Res
A.MS B.BSS C.MSC D.VLR